Ubuntu 20.10 & 20.04 LTS: USN-4999-1 Moderate: Kernel Security Advisory

ubuntu

June 23, 2021

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi (V8) systems

- linux-aws-5.8: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure-5.8: Linux kernel for Microsoft Azure cloud systems

- linux-gcp-5.8: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe-5.8: Linux hardware enablement (HWE) kernel

- linux-oracle-5.8: Linux kernel for Oracle Cloud systems

Details:

Norbert Slusarek discovered a race condition in the CAN BCM networking

protocol of the Linux kernel leading to multiple use-after-free

vulnerabilities. A local attacker could use this issue to...

Read the Full Advisory

Topics Covered

security advisory code execution Ubuntu moderate severity system crash linux kernel cloud systems

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 20.10:
  linux-image-5.8.0-1029-raspi    5.8.0-1029.32
  linux-image-5.8.0-1029-raspi-nolpae  5.8.0-1029.32
  linux-image-5.8.0-1030-kvm      5.8.0-1030.32
  linux-image-5.8.0-1033-oracle   5.8.0-1033.34
  linux-image-5.8.0-1035-gcp      5.8.0-1035.37
  linux-image-5.8.0-1036-azure    5.8.0-1036.38
  linux-image-5.8.0-1038-aws      5.8.0-1038.40
  linux-image-5.8.0-59-generic    5.8.0-59.66
  linux-image-5.8.0-59-generic-64k  5.8.0-59.66
  linux-image-5.8.0-59-generic-lpae  5.8.0-59.66
  linux-image-5.8.0-59-lowlatency  5.8.0-59.66
  linux-image-aws                 5.8.0.1038.40
  linux-image-azure               5.8.0.1036.36
  linux-image-gcp                 5.8.0.1035.35
  linux-image-generic             5.8.0.59.64
  linux-image-generic-64k         5.8.0.59.64
  linux-image-generic-lpae        5.8.0.59.64
  linux-image-gke                 5.8.0.1035.35
  linux-image-kvm                 5.8.0.1030.32
  linux-image-lowlatency          5.8.0.59.64
  linux-image-oracle              5.8.0.1033.32
  linux-image-raspi               5.8.0.1029.31
  linux-image-raspi-nolpae        5.8.0.1029.31
  linux-image-virtual             5.8.0.59.64

Ubuntu 20.04 LTS:
  linux-image-5.8.0-1033-oracle   5.8.0-1033.34~20.04.1
  linux-image-5.8.0-1035-gcp      5.8.0-1035.37~20.04.1
  linux-image-5.8.0-1036-azure    5.8.0-1036.38~20.04.1
  linux-image-5.8.0-1038-aws      5.8.0-1038.40~20.04.1
  linux-image-5.8.0-59-generic    5.8.0-59.66~20.04.1
  linux-image-5.8.0-59-generic-64k  5.8.0-59.66~20.04.1
  linux-image-5.8.0-59-generic-lpae  5.8.0-59.66~20.04.1
  linux-image-5.8.0-59-lowlatency  5.8.0-59.66~20.04.1
  linux-image-aws                 5.8.0.1038.40~20.04.11
  linux-image-azure               5.8.0.1036.38~20.04.8
  linux-image-gcp                 5.8.0.1035.37~20.04.9
  linux-image-generic-64k-hwe-20.04  5.8.0.59.66~20.04.42
  linux-image-generic-hwe-20.04   5.8.0.59.66~20.04.42
  linux-image-generic-lpae-hwe-20.04  5.8.0.59.66~20.04.42
  linux-image-lowlatency-hwe-20.04  5.8.0.59.66~20.04.42
  linux-image-oracle              5.8.0.1033.34~20.04.9
  linux-image-virtual-hwe-20.04   5.8.0.59.66~20.04.42

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.